1º_ Gargallo is a municipality located in the province of Teruel, Aragon, Spain. 2º_ Colloquially, it is a combination of gargajo with gallo ("sputum with phlegm").
It can refer to a sputum, spit or phlegm. It's also a way to call a gurgling or bubble of hot air that forms in boiling water. Bubbling.
Sputum, phlegm. ( Leon )